Which company owns MAC address prefix C8:D1:D1?

MAC address prefix C8:D1:D1 is registered to AGAiT Technology Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:D1:D1 has a network interface built by AGAiT Technology Corporation.

What is the OUI C8:D1:D1?

C8:D1:D1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AGAiT Technology Corporation. It covers every address from C8:D1:D1:00:00:00 to C8:D1:D1:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-D1-D1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C8:D1:D1:00:00:00 that is C8:D1:D1 — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.

Where is AGAiT Technology Corporation located?

AGAiT Technology Corporation is listed at 5F,No.27-8, Sec. 2, Zhongzheng E. Rd., Danshui Township Taipei County TW 25170 in the IEEE OUI registry entry for C8:D1:D1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

AGAiT Technology Corporation

MAC address prefix C8:D1:D1 is registered to AGAiT Technology Corporation in the IEEE OUI registry. Any device whose MAC address begins with C8:D1:D1 has a network interface built by AGAiT Technology Corporation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address — it covers every MAC from C8:D1:D1:00:00:00 to C8:D1:D1:FF:FF:FF.

OUI prefix: C8:D1:D1
Hyphen form: C8-D1-D1
MAC range: C8:D1:D1:00:00:00 – C8:D1:D1:FF:FF:FF
Addresses in block: 16,777,216
Organization: AGAiT Technology Corporation
Address: 5F,No.27-8, Sec. 2, Zhongzheng E. Rd., Danshui Township Taipei County TW 25170
Source: IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2016-07-29Assigned to "AGAiT Technology Corporation"
archived source →
2026-07-17Assigned to "AGAiT Technology Corporation"

Nearby in the registry

The prefixes assigned immediately before and after C8:D1:D1:

FAQ

Which company owns MAC address prefix C8:D1:D1?: MAC address prefix C8:D1:D1 is registered to AGAiT Technology Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:D1:D1 has a network interface built by AGAiT Technology Corporation.
What is the OUI C8:D1:D1?: C8:D1:D1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AGAiT Technology Corporation. It covers every address from C8:D1:D1:00:00:00 to C8:D1:D1:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-D1-D1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C8:D1:D1:00:00:00 that is C8:D1:D1 — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.
Where is AGAiT Technology Corporation located?: AGAiT Technology Corporation is listed at 5F,No.27-8, Sec. 2, Zhongzheng E. Rd., Danshui Township Taipei County TW 25170 in the IEEE OUI registry entry for C8:D1:D1. This is the address the organization registered with the IEEE, which may differ from its current operating address.